All sub 1'45" performances from 2021
| # | Mark | SR | Athlete | IR | Nat | Pos | Venue | Date |
| 1 | 1.42.91 | 1 | Nijel Amos | | BOT | 1 | Monaco | 09-07-2021 |
| 2 | 1.43.04 | 2 | Emmanuel Korir | | KEN | 2 | Monaco | 09-07-2021 |
| 3 | 1.43.17 | 3 | Clayton Murphy | | USA | 1 | Eugene OR | 21-06-2021 |
| 4 | 1.43.26 | 4 | Marco Arop | | CAN | 3 | Monaco | 09-07-2021 |
| 5 | 1.43.44 | 5 | Jesus López | | MEX | 1 | Marietta GA | 09-07-2021 |
| 6 | 1.43.57 | 6 | Ferguson Rotich | | KEN | 4 | Monaco | 09-07-2021 |
| 7 | 1.43.63i | 7 | Elliot Giles | | GBR | 1 | Toruń (KP-Arena) | 17-02-2021 |
| 8 | 1.43.73 | 8 | Patryk Dobek | | POL | 1 | Chorzów | 20-06-2021 |
| 9 | 1.43.75 | | Ferguson Rotich | 2 | KEN | 1/1 | Tokyo | 31-07-2021 |
| 10 | 1.43.76 | 9 | Cornelius Tuwei | | KEN | 1 | Heusden | 03-07-2021 |
| 11 | 1.43.76 | 10 | Emmanuel Wanyonyi | | KEN | 1 | Nairobi | 22-08-2021 |
| 12 | 1.43.81 | | Ferguson Rotich | 3 | KEN | 1 | Bruxelles | 03-09-2021 |
| 13 | 1.43.82 | 11 | Oliver Dustin | | GBR | 1 | Nice | 12-06-2021 |
| 14 | 1.43.84 | 12 | Elias Ngeny | | KEN | 1 | Nairobi | 29-05-2021 |
| 15 | 1.43.84 | | Ferguson Rotich | 4 | KEN | 1/A | Stockholm | 04-07-2021 |
| 16 | 1.43.85 | 13 | Isaiah Jewett | | USA | 2 | Eugene OR | 21-06-2021 |
| 17 | 1.43.91 | 14 | Wyclife Kinyamal | | KEN | 1 | Doha | 28-05-2021 |
| 18 | 1.43.94 | | Wyclife Kinyamal | 2 | KEN | 1 | Paris | 28-08-2021 |
| 19 | 1.43.95 | 15 | Collins Kipruto | | KEN | 1 | Marseille | 09-06-2021 |
| 20 | 1.44.00 | | Marco Arop | 2 | CAN | 2/A | Stockholm | 04-07-2021 |
| 21 | 1.44.04 | | Ferguson Rotich | 5 | KEN | 1/3 | Tokyo | 01-08-2021 |
| 22 | 1.44.05 | | Elliot Giles | 2 | GBR | 3/A | Stockholm | 04-07-2021 |
| 23 | 1.44.07 | | Elliot Giles | 3 | GBR | 5 | Monaco | 09-07-2021 |
| 24 | 1.44.11 | 16 | Peter Bol | | AUS | 1/2 | Tokyo | 01-08-2021 |
| 25 | 1.44.13 | | Peter Bol | 2 | AUS | 2/1 | Tokyo | 31-07-2021 |
| 26 | 1.44.14 | 17 | Max Burgin | | GBR | 1 | Ostrava | 19-05-2021 |
| 27 | 1.44.14 | 18 | Jamie Webb | | GBR | 2 | Chorzów | 20-06-2021 |
| 28 | 1.44.14 | 19 | Bryce Hoppel | | USA | 3 | Eugene OR | 21-06-2021 |
| 29 | 1.44.18 | 20 | Adrián Ben | | ESP | 4/A | Stockholm | 04-07-2021 |
| 30 | 1.44.18 | | Clayton Murphy | 2 | USA | 2/2 | Tokyo | 01-08-2021 |
| 31 | 1.44.20 | | Elliot Giles | 4 | GBR | 3 | Chorzów | 20-06-2021 |
| 32 | 1.44.21i | 21 | Donavan Brazier | | USA | 1 | Staten Island NY | 13-02-2021 |
| 33 | 1.44.25 | 22 | Oussama Nabil | | MAR | 1 | Rabat | 27-06-2021 |
| 34 | 1.44.25 | 23 | Yassine Hathat | | ALG | 1 | Castellón | 29-06-2021 |
| 35 | 1.44.28 | | Patryk Dobek | 2 | POL | 6 | Monaco | 09-07-2021 |
| 36 | 1.44.28 | 24 | Gabriel Tual | | FRA | 3/2 | Tokyo | 01-08-2021 |
| 37 | 1.44.30 | | Adrián Ben | 2 | ESP | 4/2 | Tokyo | 01-08-2021 |
| 38 | 1.44.31 | 25 | Marcin Lewandowski | | POL | 4 | Chorzów | 20-06-2021 |
| 39 | 1.44.33 | | Collins Kipruto | 2 | KEN | 2 | Heusden | 03-07-2021 |
| 40 | 1.44.35 | 26 | Charles Hunter | | AUS | 1 | Vida OR | 22-06-2021 |
| 41 | 1.44.35 | 27 | Daniel Rowden | | GBR | 5/2 | Tokyo | 01-08-2021 |
| 42 | 1.44.37i | | Bryce Hoppel | 2 | USA | 1 | Fayetteville AR | 31-01-2021 |
| 43 | 1.44.40 | | Jesus López | 2 | MEX | 1 | Leavenworth KS | 01-05-2021 |
| 44 | 1.44.41 | | Clayton Murphy | 3 | USA | 7 | Monaco | 09-07-2021 |
| 45 | 1.44.42 | | Cornelius Tuwei | 2 | KEN | 1 | Turku | 08-06-2021 |
| 46 | 1.44.44 | | Gabriel Tual | 2 | FRA | 2 | Nice | 12-06-2021 |
| 47 | 1.44.45 | | Ferguson Rotich | 6 | KEN | 2 | Doha | 28-05-2021 |
| 48 | 1.44.45 | 28 | Mohamed Ali Gouaned | | ALG | 2 | Nairobi | 22-08-2021 |
| 49 | 1.44.45 | | Ferguson Rotich | 7 | KEN | 2 | Paris | 28-08-2021 |
| 50 | 1.44.47 | 29 | Festus Lagat | | KEN | 1 | Azusa CA | 25-07-2021 |
| 51 | 1.44.49 | | Elliot Giles | 5 | GBR | 3/1 | Tokyo | 31-07-2021 |
| 52 | 1.44.50 | | Marco Arop | 3 | CAN | 1 | Lausanne | 26-08-2021 |
| 53 | 1.44.51 | 30 | Krzysztof Róznicki | | POL | 5 | Chorzów | 20-06-2021 |
| 54 | 1.44.51 | 31 | Isaiah Harris | | USA | 5/A | Stockholm | 04-07-2021 |
| 55 | 1.44.51 | | Marco Arop | 4 | CAN | 1 | Eugene OR | 21-08-2021 |
| 56 | 1.44.53 | 32 | Benjamin Robert | | FRA | 2 | Marseille | 09-06-2021 |
| 57 | 1.44.53 | 33 | Amel Tuka | | BIH | 2/3 | Tokyo | 01-08-2021 |
| 58 | 1.44.54i | | Jamie Webb | 2 | GBR | 2 | Toruń (KP-Arena) | 17-02-2021 |
| 59 | 1.44.54 | 34 | Michael Saruni | | KEN | 6/2 | Tokyo | 01-08-2021 |
| 60 | 1.44.56 | | Emmanuel Korir | 2 | KEN | 1 | Zürich | 09-09-2021 |
| 61 | 1.44.57 | | Collins Kipruto | 3 | KEN | 1 | Leverkusen | 27-06-2021 |
| 62 | 1.44.58 | | Isaiah Harris | 2 | USA | 4 | Eugene OR | 21-06-2021 |
| 63 | 1.44.59 | | Ferguson Rotich | 8 | KEN | 2 | Turku | 08-06-2021 |
| 64 | 1.44.60 | | Daniel Rowden | 2 | GBR | 3 | Doha | 28-05-2021 |
| 65 | 1.44.60 | | Patryk Dobek | 3 | POL | 1/1 | Tokyo | 01-08-2021 |
| 66 | 1.44.62 | | Peter Bol | 3 | AUS | 1 | Gold Coast | 12-06-2021 |
| 67 | 1.44.62 | | Emmanuel Korir | 3 | KEN | 2 | Lausanne | 26-08-2021 |
| 68 | 1.44.63 | | Cornelius Tuwei | 3 | KEN | 1 | Nairobi | 16-05-2021 |
| 69 | 1.44.63 | | Wyclife Kinyamal | 3 | KEN | 1 | Chorzów | 05-09-2021 |
| 70 | 1.44.65 | 35 | Teddese Lemi | | ETH | 6 | Chorzów | 20-06-2021 |
| 71 | 1.44.68 | | Isaiah Jewett | 2 | USA | 1 | Eugene OR | 11-06-2021 |
| 72 | 1.44.68 | 36 | Jonathan Kitilit | | KEN | 1/B | Stockholm | 04-07-2021 |
| 73 | 1.44.71 | 37 | Mark English | | IRL | 2 | Castellón | 29-06-2021 |
| 74 | 1.44.71 | 38 | Marc Reuther | | GER | 1 | Schifflange | 22-08-2021 |
| 75 | 1.44.72 | 39 | Archie Davis | | GBR | 2/B | Stockholm | 04-07-2021 |
| 76 | 1.44.74 | | Emmanuel Korir | 4 | KEN | 2/1 | Tokyo | 01-08-2021 |
| 77 | 1.44.74 | | Elliot Giles | 6 | GBR | 3/3 | Tokyo | 01-08-2021 |
| 78 | 1.44.74 | | Marco Arop | 5 | CAN | 3 | Paris | 28-08-2021 |
| 79 | 1.44.76 | | Marco Arop | 6 | CAN | 1 | Starkville MS | 30-04-2021 |
| 80 | 1.44.76 | | Amel Tuka | 2 | BIH | 4 | Doha | 28-05-2021 |
| 81 | 1.44.76 | | Patryk Dobek | 4 | POL | 1 | Montreuil | 01-06-2021 |
| 82 | 1.44.76 | | Isaiah Harris | 3 | USA | 1 | Gateshead | 13-07-2021 |
| 83 | 1.44.77 | | Jesus López | 3 | MEX | 3/1 | Tokyo | 01-08-2021 |
| 84 | 1.44.78 | 40 | Mouad Zahafi | | MAR | 2 | Schifflange | 22-08-2021 |
| 85 | 1.44.80 | 41 | Hillary Biwott | | KEN | 2 | Nairobi | 29-05-2021 |
| 86 | 1.44.80 | | Collins Kipruto | 4 | KEN | 2 | Montreuil | 01-06-2021 |
| 87 | 1.44.80 | | Patryk Dobek | 5 | POL | 3 | Marseille | 09-06-2021 |
| 88 | 1.44.80 | 42 | Saul Ordóñez | | ESP | 3 | Castellón | 29-06-2021 |
| 89 | 1.44.82 | 43 | Javier Miron | | ESP | 4 | Marseille | 09-06-2021 |
| 90 | 1.44.84 | 44 | Abdellati El Guesse | | MAR | 4/1 | Tokyo | 31-07-2021 |
| 91 | 1.44.84 | 45 | Eliott Crestan | | BEL | 4/1 | Tokyo | 01-08-2021 |
| 92 | 1.44.84 | 46 | Kacper Lewalski | | POL | 2 | Chorzów | 05-09-2021 |
| 93 | 1.44.85 | 47 | Mateusz Borkowski | | POL | 3 | Turku | 08-06-2021 |
| 94 | 1.44.85 | 48 | Jeffrey Riseley | | AUS | 7 | Chorzów | 20-06-2021 |
| 95 | 1.44.85 | | Amel Tuka | 3 | BIH | 8 | Monaco | 09-07-2021 |
| 96 | 1.44.88 | | Peter Bol | 4 | AUS | 1 | Gold Coast | 05-06-2021 |
| 97 | 1.44.88 | 49 | Noah Kibet | | KEN | 3 | Nairobi | 22-08-2021 |
| 98 | 1.44.88 | | Peter Bol | 5 | AUS | 4 | Paris | 28-08-2021 |
| 99 | 1.44.89 | | Peter Bol | 6 | AUS | 1 | Tomblaine | 05-07-2021 |
| 100 | 1.44.89 | | Elliot Giles | 7 | GBR | 1 | Székesfehérvár | 06-07-2021 |
| 101 | 1.44.89 | | Daniel Rowden | 3 | GBR | 3 | Chorzów | 05-09-2021 |
| 102 | 1.44.90 | | Marco Arop | 7 | CAN | 7/2 | Tokyo | 01-08-2021 |
| 103 | 1.44.91 | 50 | Djamel Sedjati | | ALG | 1 | Strasbourg | 16-06-2021 |
| 104 | 1.44.91 | | Wyclife Kinyamal | 4 | KEN | 2 | Gateshead | 13-07-2021 |
| 105 | 1.44.91 | | Bryce Hoppel | 3 | USA | 5/1 | Tokyo | 01-08-2021 |
| 106 | 1.44.92 | | Elliot Giles | 8 | GBR | 5 | Paris | 28-08-2021 |
| 107 | 1.44.93 | | Marco Arop | 8 | CAN | 1 | Miramar FL | 05-06-2021 |
| 108 | 1.44.93 | 51 | Catalin Tecuceanu | | ROU | 1 | Zagreb | 14-09-2021 |
| 109 | 1.44.94 | | Bryce Hoppel | 4 | USA | 1 | Walnut CA | 09-05-2021 |
| 110 | 1.44.94 | | Amel Tuka | 4 | BIH | 6/A | Stockholm | 04-07-2021 |
| 111 | 1.44.96 | | Michael Saruni | 2 | KEN | 1/2 | Nairobi | 17-06-2021 |
| 112 | 1.44.96 | | Ferguson Rotich | 9 | KEN | 2 | Zürich | 09-09-2021 |
| 113 | 1.44.97 | 52 | Brandon Miller | | USA | 2 | Eugene OR | 11-06-2021 |
| 114 | 1.44.97 | 53 | Jake Wightman | | GBR | 4 | Chorzów | 05-09-2021 |
| 115 | 1.44.98 | 54 | Thomas Randolph | | GBR | 1 | Lahti | 19-08-2021 |
| 116 | 1.44.98 | | Daniel Rowden | 4 | GBR | 2 | Zagreb | 14-09-2021 |
| 117 | 1.44.99 | | Mateusz Borkowski | 2 | POL | 8 | Chorzów | 20-06-2021 |
| 118 | 1.44.99 | 55 | Brannon Kidder | | USA | 2 | Azusa CA | 25-07-2021 |
| 119 | 1.44.99 | 56 | Abdessalem Ayouni | | TUN | 6/1 | Tokyo | 01-08-2021 |